imx8ulp: add upower api support

Add upower api support, this is modified from upower firmware exported
package.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx8ulp/upower/Makefile b/arch/arm/mach-imx/imx8ulp/upower/Makefile
new file mode 100644
index 0000000..f8b5da2
--- /dev/null
+++ b/arch/arm/mach-imx/imx8ulp/upower/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright 2020 NXP
+#
+
+obj-y += upower_api.o upower_hal.o